Native American has been viewed as a separate race, although there is evidence of asian and even european influence in the genes, if I remember correctly.
And african "black" is distinctly different from Indian and Pakastani "black", with differences in facial structure, skeletal development and musculature.
I remembered that from a couple of human genetics classes I took in college, ...
Not too mention Australian natives and Pacific Ocean natives.
Human diversity is relatively smooth, making racial divisions arbitrary.